Investigation of shock/elastic obstacles interactions by means of a coupling technique

A.-S. Mouronval (1) , B. Tie (1, 2, 3) , Abdellah Hadjadj (4) , G. Moebs (5)

1 MSSMat - Laboratoire de mécanique des sols, structures et matériaux
2 CNRS - Centre National de la Recherche Scientifique
3 CentraleSupélec
4 CORIA - Complexe de recherche interprofessionnel en aérothermochimie
5 LMJL - Laboratoire de Mathématiques Jean Leray

Arrays of obstacles have proved to be an efficient way of attenuating shock waves generated by large scale explosions. The present study intends to take into account fluid-structure interactions that may occur when elastic obstacles are used. A tractable coupling tool based on a partitioned procedure is exposed, validated on the supersonic flutter of a panel and applied to a configuration composed of square section cylinders. Several numerical difficulties related to staggering are emphasized and workarounds discussed. A methodical procedure involving one and two-way coupled simulations highlights the influence of material properties as well as the acceleration of waves in the fluid when an initial motion is prescribed to the obstacles. Finally, it is shown that uncoupled simulations may be relevant to investigate shock mitigation in some given cases.

Mots clés: Fluid-Structure Interaction; Partitioned procedure; Wave propagation; Aeroelasticity; Shock mitigation

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des structures [physics.class-ph]

A.-S. Mouronval, B. Tie, Abdellah Hadjadj, G. Moebs. Investigation of shock/elastic obstacles interactions by means of a coupling technique. Journal of Fluids and Structures, 2018, 100, pp.345-367. ⟨10.1016/j.jfluidstructs.2018.10.008⟩. ⟨hal-02088385⟩